Paper container



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Patented Nov. 25, 1930 UNITED STATES PATENT OFFICE GEORGE HERETH GARDNER, or CHICAGO, ILLINOIS, ABSIGNQB. 'ro THE ummsnn' rnonuc'rs COMPANY, or CHICAGO, ILLINOIS, A coRroaArIon or wxsconsm PAPER CONTAINER Application filed December 7, 1928. Serial No. 824,367.

This invention relates to a paper container of the type having an inner sealing dlsk.

It is-an object of this invention to provide a tubular container of fibrous material provided with an inner sealing disk adapted to permit the container to hold liquidmatenal and especially hot liquids, for a prolonged period without lea-king.

It is a further important object of this 1n+ vention to provide a simple and economical paper container structure embodying 1mproved liquid sealing features.

, Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings. v

This invention (in a preferred form) is 11- lustra-ted in the drawlngs and hereinafter more-fully described.

On the drawings:

Figure 1 is a perspective view of a paper container embodying the features of my in vention;

Figure 2 is an enlarged top plan viewof the same; and I Figure 3 is a further enlarged elevational view'with parts broken away and in section.

The reference numeral 1 Indicates a tubular container, preferably formed of spirally wound paper board or similar fibrous material. As best shown in Fig. 3, the wall of the container 1 is provided with a lower beaded edge 2 formed by turning the lower edge of said wall inwardly and upwardly as at 3. The bottom of thecontainer 1 is formed separately from a disk 4 of larger diameter than the inside diameter of the tubular container 1. Said disk 4 is formed with an annular raised portion 5 adapted when the disk is in place to lie adjacent to the inner wall of the container 1. The edge portion of the disk 4 lying outside of the annular raised'portion 5 is turned downwardly as at 6 to lie a ainst the inner surface of the container wal and folded inwardly and upwardly as at 7 within the fold 3 of the beaded edge 2. The extreme edges 8 and 9 of the disk flange 6 and the wall fold 3, respectively, are both turned outwardly to lie against the inner surface of sand d1sk flange 6 and press said flange against the inner surface of the wall of the container 1.

The peripheral edge 9 furthermore extends into the groove 10 formed on the reverse side of the annular raised portion 5 to complete the locking seal formed between the flange of the disk 4 and the beaded edge 2 of the side wall of the container. 7

It is customary, although not absolutely essential, to render the sealing joint thus formed absolutely liquid tight by filling the joint between the peripheral edge 9 and the surface of the groove 10 with parafiin or other water-proof material. Even where this is done, however, there is a tendency for liquids, and especially hot liquids, to penetrate into the. folds of the beaded edge 2 and cause a swelling thereof that will expand the various joints and allow leaks to occur. It is for this reason that the container of my construction is .provided with an inner sealing disk 11 formed of relatively heavy paper board or like material.

Said inner sealing disk 11 is accurately formed of a diameter exactly equal to the inner diameter of the tubular container 1 so that its peripheral edge 12 fits snugly against the inner surface of said container wall but without causing any distortion of said wall to the slightest degree. Said disk 11 furthermore is-formed from a plane sheet of paper board and is not dished or flared at its edges as in certain commercial structuresof this general type. Both the upper and lower surfaces of the disk 11 are thoroughly sized or otherwise rendered waterproof in any of the wellknown ways, but the fibers between the two surfaces are left in a substantially unsized or at least relatively unsized condition. The result is that when the container is filled with a liquid, should any of the li uid seep down.

and cause these fibers to swell and ex and outwardly against the inner surface 0 the container wall. This outward pressure of the intermediate fiber stratum effectively seals the joint between the peripheral edge of the disk 11 and the inner surface of the container wall to prevent further sdapage of the liquid beyond the upper surface of t e disk 11 it has beyond said disk. The fact that both surfaces of the disk 11 are thoroughly sized or waterproofed has a tendency to prevent ex pansion and swelling of the intermediate fiber in any direction other than that parallel to the plane of the disk and outwardly against the side wall of the container.

The effectiveness of the inner disk 11 as a sealing medium to prevent the seepage of liquids into the folds of the beaded edge 2 is probably further increased by the fact that the disk 11 rests directly upon the top surface of the annular raised portion 5, thereby forming an air space 13 between the lower surface of said disk 11 and the upper surface of the flanged bottom disk 4: and an annular space 14 of triangular cross-section bounded by the inner surfaces of the disk 11 and of the container wall and the outer surface of the bottom disk flange 6. Obviously, if any liquid is to penetrate into these spaces 13 and 14:, the air contained therein must be free to escape but escape is rendered impossible by the tightness with whichthe inner sealing disk 11 presses against the inner surface of the container wall and the lock tight nature of the lower folded edge of the container.

It is thus apparent that my construction provides a very efficient liquid-tight seal for the bottom of paper containers of the type described. It is furthermore apparent that the paper containers of my invention may be readily and cheaply manufactured on a large scale.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

I claim as my invention:

1. A paper container, comprising a tubular body portion, a lower flanged disk having an annular raised portion adapted to lie adjacent to the wall of the container, the wall of said body portion and the flange of said lower disk together forming a lower edge for the container and an inner plane sealing disk of a diameter equal to the inner diameter of said tubular body portion adapted to fit snugly into said tubular body portion above said lower disk and to rest upon said annular raised portion.

2. A paper container, comprising a tubular body portion, a bottom disk having an annular raised portion and a downturned peripheral flange, the lower wall portion of said container and said flange being folded upwardly and crimped outwardly to form a lower beaded edge, and an inner plane sealing disk of the same diameter as the inside diameter of .the tubular body portion adapted to fit snuglywithin said tubular body portion above said bottom disk upon said annular raised portion.

3. A paper container, comprising a tubular body portion, a bottom disk having an annular raised portion and a downwardly turned peripheral flange, the lower tubular body portion and said flange being folded together inwardly and upwardly with their respective edges crimped outwardly against the inner surface of said flange, and an inner plane sealing disk of a diameter exactly equal to the inside diameter of said tubular body portion positioned therein to rest upon said annular raised portion of the bottom disk, said inner sealing disk being formed of paper board having waterproofed upper and lower surfaces and a relatively unsized intermediate fibrous stratum.

4. A liquid-tight bottom structure for tubular paper containers wherein the container body has an upwardly opening bead at the lower end" thereof, a bottom disc having a beaded flange locked in the bead of said body, an upwardly extending annular ridge on said bottom disc, and a sealing disc of the same diameter as the inner diameter of'said container body seated on said bottom disc but spaced therefrom by said annular ridge to form an air space between said discs, whereby the tendency of liquids to seep past the edges of said sealing disc is resisted by the pressure of air in said air space.

5. A liquid-tight bottom structure for tubular paper containers wherein the container body has an upwardly opening head at the lower end thereof, a closure disc having a beaded flange locked in the bead of said body, an upwardly extending annular ridge on said closure disc adjacent the walls of the container, a sealing disc of the same diameter as the inner diameter of said container body seated on said closure disc but spaced therefrom by said annular ridge to form an air gap between said discs, whereby the tendency of liquids to seep past the edges of said sealing disc is resisted by the pressure of the air in said air gap, said sealing disc being formed of paperboard having avaterproofed upper and lower surfaces and a relatively unsized intermediate fibrous portion adapted to swell when wet and thereby become firmly locked to the side walls of said container.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County, Illinois.

GEORGE HERETH GARDNER. 

